Pulley-bushing.



E. J. WALIHER.

PULLEY BUSHING.

.APPLICATION FILED 1130.1, 1911.

Patented 52111.26, 1915E THE NoRFr/s PETERS cov PHoro-urHo..n/AsHiNuroN. n. c

5 @mam/WMM@ UNITED STATES PATENT OFFICE.

RICHARD J. WALTHER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THEAMERICAN PULLEY COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPU- RATIONF PENNSYLVANIA.

PULLEY-BUSHING.

Application filed December 1, 1911.

To all 'whom it may concern Be it known that I, RICHARD J. Wann-mn, ofPhiladelphia, in the county of Philadelpliia and State of Pennsylvania,have invented certain new and useful Improve ments in Pulley-Bushings,whereof the following is av specification, reference being had to theaccompanying drawings.

In said drawings, Figure I, represents an exterior view, in sideelevation, of a bushing embodying my invention. Fig. II, is an axiallongitudinal section thereof. Fig. III, is a transverse section on theline III, III, of Fig. II.

It is not deemed necessary to illustrate the pulley whose hub embracesthe bushing,

Y nor the shaft embraced by the latter, as

their construction and relation to the bushing are well understood.

The drawings show my invention in one specific form, the type selectedbeing a bushing which is adapted to be applied to a tapering shaft, butit must be understood that the invention is not necessarily thuslimited.

The bushing comprises external and in` .ternal shells respectivelyconstructed as follows. The external or casing shells, 1, and 2,respectively, are semicylindrical and are preferably made of sheet steelpressed into the desired shape. The internal surface of each casingshell is provided with a plurality of inwardly projectingcircumferential ribs arranged substantially at right angles to the axisof the bushing, in this instance, said ribs are four inV number, thoseon the upper shell being indicated at 4, 5, 6, and 7, respectively. Saidcircumferential ribs may be conveniently constructed by pressing themetal of the casing shell inwardly, the corresponding depressions beingvisible on the exterior of the casing. These ribs are relatively narrow,z'. e., their cross section is of short extent in the direction of theaxis of the bushing, and hence the intermediate external bearingsurfaces are of relatively long extent in an axial direction. Thestructure thus formed is strengthened by the ribs, while theintermediate portions present a true cylindrical external bearingsurface for the pulley hub.

It will be noted that in the instance shown the inward extension, ordepth of these circumferential ribs, varies progressively from one endof the bushing to the Specification of Letters Patent.

Patented Jan. 26, 1915.

serial No. 663,189.

other, the rib indicated by the numeral 4, being the shallowest, and theone indicated at 7, being the deepest, while those indicated at 5, and6, respectively, have such depths that their extreme innermost portionslie in a straight line drawn from the innermost portion of the rib 4, tothat of the rib 7.

The circumferential ribs on the lower casing shell 2, are similar innumber, location and 'relative dimensions to those of the upper shell sothat they need not be described in detail.

The internal shells l0, and 11, preferably of sheet stecl,are mountedwithin and embraced by the respective halves of the casing. Theseinternal shells are similar to one another and may be constructed asfollows: Referring to the upper one marked 10, it will be seen that inthis instance its form is a section of the frustum of a hollow cone,whose pitch is such that its ex terior surface coincides with the linepreviously referred to as the line of innermost extension of the ribs 4,5, 6, and 7, upon the casing shell 1. The internal surface of the shell10, is flush, and therefore, adapted to fit closely upon a shaft, andthe external surface (in this instance flush also) is adapted to abutuniformly against the inner extremities of the ribs. Said inner shell issubstantially coextensive in longitudinal extent with the region ofextent of the ribs upon the outer shell, and the metal of said innershell is, as shown, of substantial body, so that it distributes upon theshaft the strain of compression locally applied through the ribs atlongitudinal intervals only. The internal shell 10, is also preferablyprovided with a number of elongated slots, such as 12, and 18, the slots12, extending out at the respective extremities, while the slots 13, areinclosed. These slots are preferably arranged in the staggered relationindicated in the drawings, and increase the elasticity of the internalshell.

At circumferential intervals the internal shell 10, is secured to thecasing shell 1, by means of rivets 14, 15, 16, and 17, located in theseveral ribs. Near each extremity of the casing, clamping yokes areprovided, as indicated respectively at 20, 21, 22, and These yokes arepreferably made of pressed steel, and have the U-shaped cross sectionindicated. They are arranged in opposing pairs, `so as to embrace theshells of the casing, being conveniently secured thereto by means o fcertain of the'rivets which secure the internal shells to the casingshells. Thus, referring to the yoke-pieces 20, and 21, which areuppermost in the dra-wings, it will be seen that the rivets 16, and 17,vwhich are vlocated near ythe respective extremities of the casing shelll, extend not only through the internal shell l0, and the easing shellitself, but also through the yoke pieces and vhold them in position. Theyoke pieces are provided with threaded clamping bolts 25, and 26, havingnuts and jam `nuts 27, and 2S, 29, and 30, whereby the yokes may bedrawn together, thus directly clamping the bushing upon a shaft havingthe proper configuration. d

As be'fore stated, in the embodiment shown, the bushing is intended foruse upon a tapering shaft, whose surface Vis coincident with the innersurface of the internal shells 10, and l1, but the pitch of these may bevaried to accommodate the device to a shaft having any desired taper,and obviously, to a cylindrical shaft, the several ribs i, 5, vt, and 7,in this lastV instance, being similar to one another in extent of inwardprojection.

One or more bosses such as 31, and 32, may be rigidly mounted upon theexternal casing by means of inwardly projecting stems, whose inner endsare riveted as shown. Said bosses are located in the interspace betweenthe clamping devices and are adapted to register with and entercorresponding holes formed in the hub `of a pulA ley. They 'thus serveto prevent the pulley from shifting its position with relation to thebushing, which latter is itself directly secured to the shaft.

.Having thus described my invention, I claim:

l. In a two-part bushing, the combination of; a pair of casing shells,each hai/*ing a plurality of inwardly projecting narrowl circumferentialribs whose inner extremities are in substantial alinement, and khavinglong cylindrical external bearingisurfaces between said ribs; a pair ofinternal shells each having a flush internal surface, and having` anKexternal surface which is adapted to. abut against said ribs; `andmeans whereby the two parts of the bushing may be directly secured to ashaft.

2. In a two-part bushing, the combination of; a. pair of casing shellseach having a plurality of inwardly projecting narrowcircumferentiahribs whose inner extremities are in substantialalinement, and having long cylindrical external bearing 'surfacesbetween said ribs; a pair of internal shells each Yhaving la flushinternal surface, and an external surface which is adapted to abutCopies of this patent-may be obtained for againstsaid ribs, and beingprovidedwvith longitudinally 4.extending slots;Y and means whereby thetwo parts of thevbushing may be secured to a shaft.

In a two-part bushing, the combination of; Va pair of casing shells eachhaving a plurality of inwardly projecting narrow circumferential ribswhose inner extremities are in substantial alinement, but increase ininward projection progressively from one end of the shell tothe otherend thereof, and having long cylindrical external vbearing surfaces ofequal radial projection, between said ribs; a pair of internal shellseach having a Hush internal surface, and an external surface which isadapted `to abut against said ribs; and meanswhereby the two parts ofthe bushing may be secured to a shaft. j

a. In a two-part bushing, the combination of; a pair of casing shellseach having a plurality of inwardly projecting narrow circumferentialribs whose inner extremities are in substantial alinement, and havinglong cylindrical external bearing surfaces between said ribs; a. pair ofinternal shells each having a flush internal surface, and an externalsurface which is adapted to abut against said ribs; clamping devicesarranged at the extremities of the casing shell whereby the two parts ofthe bushing may be di-v rectly secured to a shaft, while providing aninterspace for attachment of a pulley; and an externally projecting bossrigidly mounted upon each casing shellfat a point intermediate betweensaid clamping devices.

5'. In a two-part bushing, the combination of; a pair ofcasing shells,eachhaving a plurality of inwardly 'projecting narrow cireuniferentialribs whose inner extremities are in substantial alinement, and havinglong cylindrical external bearing surfaces between said ribs; a pair ofinternal shells each having a flush internal surface, and having anexternal surface which is adapted to abut against said ribs; meansforpermanently securing'each internal shell to its cor-relative casingshell; a` pair of `yoke pieces adapted to embrace each easingshell andpermanently attached thereto near the respective extremities thereof;and clamping bolts whereby one member of each pair of yoke'pieces maybeV drawn toward the corresponding member of t-he other pair, todirectly secure the bushing to a shaft. Y

In testimony whereof, I-have hereunto signed my name `at Philadelphia,Pennsylvania, this eighteenth day of November j 'RICHARD J. VVALTI-IER.

IVitnesses Y JAMES H. BELL,

E. L. FULLmrroN.`

kjve.iamts each, by addressing the Commissioner ofV Patents.

Washington, D. C.

